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Re: Wireless transmission of power,
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- Subject: Re: Wireless transmission of power,
- From: "Tesla list" <tesla@xxxxxxxxxx>
- Date: Thu, 17 Mar 2005 19:11:15 -0700
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Original poster: Jim Lux <jimlux@xxxxxxxxxxxxx>
At 10:55 AM 3/17/2005, you wrote:
Original poster: "Sean Taylor" <sstaylor@xxxxxxxx>
To start with, power stations are the most inefficient part. The Second
Law of thermodynamics limits the efficiency of a practical heat engine to
I'm getting kinda tired of this whole discussion, but I had to jump in on
this part. Where do you think the energy for the central "transmitter"
would come from? It would have to be a power plant, and a HUGE one at
that. The total power consumption of the world in 2002 was over 15
TRILLION KWHrs. If the load was steady year round, this translates to a
power of about 1.7 GW, not to mention demand loads, etc.
Uhhh... 1.7 GW isn't all that big a power plant. 2 GW is a standard power
I think you missed a factor of a thousand.. 15 Trillion (15E12) kWh is
15E15 Wh, divided by 8766 hrs/yr is 1.7 TW... 1700 GW, a substantially
larger power plant.
However, consider that sunlight falling on the earth's surface is
1kW/m2. Figure you get 1/3 that on the average (8hr/dy sunlight) and you
get 30% conversion efficiency to electricity using solar thermal
electric. Call it 100 W/m2 to your transmitter. So, you need about 17
billion square meters of collector, which sounds like a lot, at
first. But, it's 17,000 square kilometers, or a square about 130 km on a
side. There are several places in California, Nevada, Arizona, etc. (or
northern Mexico) which could accomodate such a facility without too much
But the real question, since there will be inevitable inefficiencies in
transmitting and receiving the power by the Tesla approach (he never
claimed it was lossless, I think), why not just put the solar electric
collectors near the loads and use conventional distribution technology for
the "last mile".
FWIW, I think 15 PWh might be an underestimate.
building a plant that large, and making a coil from wire that will handle
that kind of power! We're also ignoring the inefficiency of the Earth and
its atmosphere as conductors, as well as the problem of making the upper
atmosphese conductive - satellite communication would no longer work!
It's time to face reality: The idea of wireless transmission of power for
the world would just not work out.
Sean Taylor, MSEE